Fuse-plug.



' fiverzf PATENTED JUNE 14, 1904. R. HUNDHAUSE-N. FUSE PLUG. APPLICATIONFILED NOV.24,1899.

N0 MODEL.

UNITED STATES Patented June 14. 1904.

PATENT OEErcE.

RUDOLF HUNDHAUSEN, OF WILMERSDORF, GERMANY, ASSIGNOR TO SIEMENS 8:HALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS, A CORPORATIONOF ILLINOIS.

FUSE-PLUG.

SPECIFICATION forming part of Let ers Pa e No. 762,824, dated June 14,1904.

Application filed November 24, 1899. Serial No. 738,160. (No model.)

To all whom it may concern:

Be it known that I, RUDoLE HUNDHAUSEN, a subject of the Emperor ofGermany, residing at I/Vilmersdorf, near Berlin, Germany, have inventeda certain new and useful Improvement in Fuse=Plugs, of which thefollowing is a full, clear, concise, and exact description, referencebeing had to the accompanying drawings, forming a part of thisspecification.

The present invention relates to improvements in fuse-plugs, moreparticularly to the interchangeable plugs for electric safety deviceswhose fuses are surrounded by an insulating body of cylindrical formhaving its electrodes on the end faces thereof.

It is the object of this invention to provide a fuse-plug which shallnot be materially injured upon short-circuits and in which a compact andreadily-manufactured construction is employed wherein the danger of thecon tinuations of an arc is avoided.

I will explain my invention in detail by reference to the accompanyingdrawings, in

- which-- Figure 1 is an external View of a complete plugdiagrammatically connected in circuit.

Fig. 2 is a vertical cross-section of the plug,

showing the fuses in their relation to the contact parts. Fig. 3 is across-section at right angles to that of Fig. 2 with the device bottomside up and one terminal plate removed. Fig. 4 is a top view with aterminal plate removed. Fig. 5 is a top view with the terminal plate inplace. Fig. 6 is a horizontal section through the center of the plug online 6 6 of Fig. 3. Fig. 7 is a sectional view on line 7 7 of Fig. 6.

Similar letters of reference refer to similar parts throughout theviews.

The device which has been shown in the drawings to illustrate theinvention comprises a cylindric structure A, consisting of outer andinner concentric cylinders b and 0. At the opposite ends ofthe structureA there are arranged walls 6 and e, which extend transversely across aportion of the space between the inner and outer cylinders c and b. Thewalls 6 and c are on opposite sides of the device. The wall 0 extendstransversely across a portion of the space between the inner and outercylinders at one end of the device, and the wall 6 extends across theother side of that space at the opposite end of the device. This givesthe walls 6 and a a sector-like shape when viewed in plan, as shown inFig. 4. The walls c and e are connected by walls in 20 which extendlongitudinally of the device between the radial sides of the walls a ande, thus with the walls 0 and c dividing the space between the outer andinner cylinders 7) and 0 into two chambers h and if, which are open,respectively, at opposite ends of the device and closed at their otherends, as shown in Fig. 7 The walls w 01: are conveniently inclined fromthe axis of the cylinders, so that the chambers It and 7& flare at theiropen ends. Each of the walls in Q0 has a transverselyextending portionat its middle, and these portions in the two walls are provided withapertures (Z (Z On one side of the device the wall 10 is desirablyformed so as to provide a space 0, Figs. 2 and 6, which communicates atits top and bottom with the chambers and 7&2.

The outer cylindric casing 7) is desirably constructed with indentationsor recesses f, f f", f f and f which by their presence make the portionsof the casing 7), forming their inner walls, very thin.

The transverse walls 0 and a are provided with openings d and (1*,forming openings through those walls into the chambers 7L2 and h,respectively, as shown in Fig. 3. A couple of fusess and are arranged inthe chambers h and/r the fuse a being extended from the middle of thechamber it to the wall '20 and through the opening (Z therein into thechamber if and to the middle thereof, and the fuse 8 being extended fromthe middle of the cham ber It on the opposite side thereof to the wall102 through the opening (Z therein and thence into and to the middle ofthe chamber l1? on the side opposite the fuse s. This arrangement of thefuses is shown in Figs. 2 and 4, the fuses in the chamber it being shownin the lower portions of both figures and in the chambers 7L and b berif in dotted lines in the upper portion of Fig. 2. It will be rememberedthat in Fig. 2 the fuses are shown in full in the lower part of thefigure, although in reality they would not appear, since the figure is avertical section through the center of the device.

A couple of contacts a and a are connected with the fuses s and 8 thecontact a being connected therewith at the meeting thereof in thechamber h and the contact a being connected at their junction in thechamber 73. The contacts a and a extend, respectively, through theopenings or apertures d and d, as well shown in Fig. 3. The fuses s ands are therefore in parallel in the circuit.

The opposite ends of the device are provided with metalliccontact-plates K and K respectively. These plates are fitted intosuitable annular recesses formed for them at the opposite ends of thedevice and are provided with central circular openings and also withopenings through which the contacts a and a can pass. The contacts a and(t are bent down over the contact-plates K and K as shown in Figs. 3 and5.

The chambers h and b are substantially filled with a suitable dielectricn, such as talcum powder, except at their ends, where the fuses passthrough the holes, which spaces are filled with masses 6 of gypsum orlike material for securing a thorough sealing of the device. Thecontacts a and a are desirably secured in place in the apertures (Z andd by means of putty, Fig. 3.

As a preferred arrangementasupplemental fuse m of smaller capacity thanfuses .s and s is provided and extended between the contacts a and a Itis desirably arranged so as to pass through the space 0, and thereby.become exposed to outside view.

In the construction of thedevice the contacts a a are soldered to thefuses s, .9 and 121 when the contacts are outside of the cham- They arethen inserted in these chambers and pushed through the apertures (Z andcl", after which the apertures and chambers are provided with putty,gypsum, and talcum powder, as before specified, and then the plates Kand K are placed in position and the contacts a and a bent down andsecured to them.

The device has the advantage that when the fuses s and s blow the entirerupture occurs inside of the device, and therefore no danger exists byreason of sparking or a continuation of the arc. If the eruptive poweris great, the thin portions of the outer casing 5, forming the rearwalls of the recesses f f &c., will become broken, thereby allowing theejection of the dielectric contained in the two fuse-chambers. Thisexplosion of the dielectric, however, willbe in such a direction that itwill tend to extinguish or break the arc and will not permit itscontinuation. The presence of the supplemental fuse m makes it possibleto observe from the outside whether or not the device has been operatedand requires its fuses to be replaced.

The device is especially fitted for use in places where heavydischarges, due to short circuits, are possible by reason of the factthat the continuation of the arc is absolutely prevented. The devicealso has the advantage of simplicity and cheapness of construction.

What I claim as my invention is 1. In adevice of the class specified,the combination of interior and exterior casings arranged to provide aspace between them, walls extended in said space so as to divide thesame into two fuse-chambers, the said walls having small perforationsfor the fuses communicating with the fuse-chambers, fuses arranged insaid chambers and extended through the perforations in said walls, meansfor sealing said chambers, and contacts connected with the fuses andextended outside of the device, substantially as set forth.

2. In a device of the class specified, the combination of the interiorand exterior cylindric casings, longitudinally extending walls dividingthe space between said casings into two chambers, the said walls beingprovided with small perforations communicating with the oppositechambers, fuses arranged in said chambers and extended through saidapertures in the walls, means for sealing said chambers, and contactsconnecting with the fuses and extended outside of the device,substantially as set forth.

3. In a device of the class specified, the combination with interior andexterior cylindric casings, of transverse walls extended across oppositeends of the space between said casings, longitudinally-arranged wallsextending between said transverse walls so as, with said transversewalls, to divide the said annular space between the casings into twochambers, the said longitudinally-extending walls being provided withapertures for the fuses, fuses arranged in the chambers into which thesaid annular space is formed, and extended through the said apertures insaid longitudinallyextending walls, insulating material in saidchambers, metallic contactplates at the opposite ends of the casingsforming closures for the space between the same, and contacts connectedto the fuses and extended through said metallic plates, substantially asdescribed.

a. In a device of the class specified, the combination with a casingaffording a fuse-chamber, the said casing having a couple of smallfuse-apertures, a main fuse arranged in said chamber, a supplementalfuse also arranged therein but extended through said apertures so as tobe visible from the outside of the casing, means for sealing thechamber, and a contact connected with said fuses and extended to theexterior of the device, substantially as set forth.

5. In a device of the class specified, the combination with a casingprovided with walls dividing it into a couple of fuse-chambers, the saidcasinghavingacouple of small fuse-apertures, main fuses arranged in saidfuse-chambers, a supplemental fuse extended through said apertures so asto be visible from the outside of the device, means for sealing saidchambers, and contacts connected with said fuses and extended to theoutside of the device, substantially as described.

6. A'device of the class specified, comprising a tubular structureconsisting of interior and exterior casings, transverse walls partlyclosing opposite sides of the opposite ends of the space between thecasings and longitudinally-arranged walls extending between saidtransverse walls so as to divide the annular space between the casingsinto two chambers, the said longitudinal walls having small perforationscommunicating with the opposite chambers and the outer casing beingprovided with a couple of apertures communicating with its interior andexterior, and with recesses in its sides, fuses arranged in saidchambers and extended between the same by way of the apertures in saidlongitudinally-arranged walls, a supplemental fuse also arranged in saidchambers and extended through the apertures in said outer casing,contacts connected with said fuses and extended outwardly therefrom, adielectric arranged within the chambers, and metallic plates secured tothe opposite ends of the tubular structure and having apertures throughwhich the said contacts extend, the contacts being connected with thesaid metallic plates, substantially as described.

7. In a device of the class specified, the combination with a tubularsealed structure providing the fuse-chamber, the said structure having athick wall made thin in spots or pertions, fuses arranged in saidchamber, and a dielectric also in said chamber, substantially as setforth.

8. In a device of the class specified, a tubular sealed structureprovidinga fuse-chamber, the said structure being made with recessedportions, reducing the thickness of its walls in spots, fuses arrangedin said chamber, and a dielectric also arranged therein, substantiallyas described.

9. In an electric fuse or cut-out, the combination with an envelopedmain fuse-wire and its casing, of an auxiliary or indicating fusewirewithin the chamber of said casing but having an indicating partextending to the outside of said casing.

10. In an electric fuse or cut-out, the combination with an envelopedmain fuse-wire and its casing, of an auxiliary or indicating fusewirewithin the chamber of said casing, but having a part projecting throughthe casing to the outside thereof.

11. In an electric fuse or cut-out, the combination with an envelopedmain fuse-wire and its casing, of an auxiliary or indicating fusewirewithin the chamber of said casing but having a part looped through thewall of the casing to the outside thereof.

12. In an electric fuse or cut-out, the combination with an envelopedfuse-wire and its casing, of an auxiliary or indicating fuse-.wirewithin the chamber of said casing, but laced through openings in thewall of the casing so that a part thereof lies on the outside of thecasing.

13. In an electric fuse orcut-out, a casing, a fuse-wire within thecasing, but having a part between its ends extending to the outsidethereof, and a heat-dissipating filling within the casing making contactwith that part of the fuse-wire which lies within the casing.

1 1. In an electric fuse or cut-out, a casing, a fuse-wire within thecasing, but laced through openings in the wall thereof so that part ofthe fuse-wire lies outside of the casing, and a heatdissipating fillingwithin the casing making contact with that part of the fuse-wire whichlies within the casing.

15. In a safety-fuse, the combination with a case and means mechanicallyclosing the ends thereof, of a fusible strip extending through the case,terminals for the said fuse and an indicator-wire partially within thechamber of said case and partially exposed upon the outer surface of thecase with its ends electrically connected with the fusible strip.

16. In a safety-fuse, the combination with a case, its ends andterminals, of a fusible strip extending through the case andelectrically connected with the ends and terminals and an indicator-wirepartially within the chamber of said case and partially exposed upon theouter surface of the case with its ends electrically connectedwith thefusible strip.

17, In a safety-fuse, the combination with a case and means mechanicallyclosing the ends thereof, of a fusible strip extending tl'n'ough thecase, a non-conducting filling material in the case surrounding thefusible strip, terminals for the said fusible strip, and anindicatorwire partially within the chamber of said ease and partiallyexposed upon the outer surface of the ease with itsendselectricallyconnected with the fusible strip.

18. In an electric fuse or cut-out, the combination with a mainfuse-wire and its inclosing casing, of an auxiliary or indicatingfuse-wire within the inner surface of the shell of said casing buthaving a part extending to the outside of said casing.

In witness whereof I hereunto subscribe my name this 2d day of November,A. D. 1899.

RUDOLF HUN DHAUSEN.

itnesses:

W OLDEMAR HAUPT, HENRY Hasrnn.

